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New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Increase (decrease) in accounts receivable $ 191,892     $ 600 $ 257,769    
Stockholders' Equity Attributable to Parent $ (1,350,792) $ (1,495,282) $ (1,333,186)   (1,383,717) $ (1,483,328) $ (1,503,738)
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member          
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' Equity Attributable to Parent $ 472,576 $ 263,525 $ 457,804 $ (600) $ 406,755 $ 295,643 $ 251,579